American Airlines has teamed up with Harrah’s to offer a summer promotion allowing members to win prizes by testing their knowledge of American Airlines’ e-mail products.

Five grand prize winners will each receive economy-class air travel and hotel accommodations for two at Harrah’s San Diego, along with a chance to participate in the casino’s Total Rewards loyalty program’s “3 Million on the House” event in September, in which the winner will receive $1 million. The second prize will be 1 million AAdvantage miles, and the third prize will be 1 million Reward Credits.